If there are witnesses that can back him up and he has photos of the location of the cars after the collision these can assist.
She should be making a detailed record of what happened as well as diagrams as to where his vehicle was and what happened.
He is going to gave to get quotes for the repairs and send them to the other party requesting payment and if they refuse then tell them he will sue.
The process is set out in the following link
It is his word against the other party but the more he can remember and if he has witnesses and photos at the scene they will assist in his case.
I hope this makes sense and is of assistance. if there is nothing further
thank you for using my services.
If I have missed anything, or you have any further questions please let me know
If there is anything else in the future please do not hesitate to ask.
Please do not forget to leave positive feedback.